Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | # |
2 | # Block device driver configuration | |
3 | # | |
4 | ||
afd44034 | 5 | menuconfig MD |
1da177e4 | 6 | bool "Multiple devices driver support (RAID and LVM)" |
afd44034 | 7 | depends on BLOCK |
83fe27ea | 8 | select SRCU |
1da177e4 LT |
9 | help |
10 | Support multiple physical spindles through a single logical device. | |
11 | Required for RAID and logical volume management. | |
12 | ||
afd44034 JE |
13 | if MD |
14 | ||
1da177e4 LT |
15 | config BLK_DEV_MD |
16 | tristate "RAID support" | |
1da177e4 LT |
17 | ---help--- |
18 | This driver lets you combine several hard disk partitions into one | |
19 | logical block device. This can be used to simply append one | |
20 | partition to another one or to combine several redundant hard disks | |
21 | into a RAID1/4/5 device so as to provide protection against hard | |
22 | disk failures. This is called "Software RAID" since the combining of | |
23 | the partitions is done by the kernel. "Hardware RAID" means that the | |
24 | combining is done by a dedicated controller; if you have such a | |
25 | controller, you do not need to say Y here. | |
26 | ||
27 | More information about Software RAID on Linux is contained in the | |
28 | Software RAID mini-HOWTO, available from | |
29 | <http://www.tldp.org/docs.html#howto>. There you will also learn | |
30 | where to get the supporting user space utilities raidtools. | |
31 | ||
32 | If unsure, say N. | |
33 | ||
a364092a AV |
34 | config MD_AUTODETECT |
35 | bool "Autodetect RAID arrays during kernel boot" | |
ce52aebd | 36 | depends on BLK_DEV_MD=y |
a364092a AV |
37 | default y |
38 | ---help--- | |
39 | If you say Y here, then the kernel will try to autodetect raid | |
40 | arrays as part of its boot process. | |
41 | ||
42 | If you don't use raid and say Y, this autodetection can cause | |
43 | a several-second delay in the boot time due to various | |
44 | synchronisation steps that are part of this step. | |
45 | ||
46 | If unsure, say Y. | |
47 | ||
1da177e4 LT |
48 | config MD_LINEAR |
49 | tristate "Linear (append) mode" | |
50 | depends on BLK_DEV_MD | |
51 | ---help--- | |
52 | If you say Y here, then your multiple devices driver will be able to | |
53 | use the so-called linear mode, i.e. it will combine the hard disk | |
54 | partitions by simply appending one to the other. | |
55 | ||
56 | To compile this as a module, choose M here: the module | |
57 | will be called linear. | |
58 | ||
59 | If unsure, say Y. | |
60 | ||
61 | config MD_RAID0 | |
62 | tristate "RAID-0 (striping) mode" | |
63 | depends on BLK_DEV_MD | |
64 | ---help--- | |
65 | If you say Y here, then your multiple devices driver will be able to | |
66 | use the so-called raid0 mode, i.e. it will combine the hard disk | |
67 | partitions into one logical device in such a fashion as to fill them | |
68 | up evenly, one chunk here and one chunk there. This will increase | |
69 | the throughput rate if the partitions reside on distinct disks. | |
70 | ||
71 | Information about Software RAID on Linux is contained in the | |
72 | Software-RAID mini-HOWTO, available from | |
73 | <http://www.tldp.org/docs.html#howto>. There you will also | |
74 | learn where to get the supporting user space utilities raidtools. | |
75 | ||
76 | To compile this as a module, choose M here: the module | |
77 | will be called raid0. | |
78 | ||
79 | If unsure, say Y. | |
80 | ||
81 | config MD_RAID1 | |
82 | tristate "RAID-1 (mirroring) mode" | |
83 | depends on BLK_DEV_MD | |
84 | ---help--- | |
85 | A RAID-1 set consists of several disk drives which are exact copies | |
86 | of each other. In the event of a mirror failure, the RAID driver | |
87 | will continue to use the operational mirrors in the set, providing | |
88 | an error free MD (multiple device) to the higher levels of the | |
89 | kernel. In a set with N drives, the available space is the capacity | |
90 | of a single drive, and the set protects against a failure of (N - 1) | |
91 | drives. | |
92 | ||
93 | Information about Software RAID on Linux is contained in the | |
94 | Software-RAID mini-HOWTO, available from | |
95 | <http://www.tldp.org/docs.html#howto>. There you will also | |
96 | learn where to get the supporting user space utilities raidtools. | |
97 | ||
98 | If you want to use such a RAID-1 set, say Y. To compile this code | |
99 | as a module, choose M here: the module will be called raid1. | |
100 | ||
101 | If unsure, say Y. | |
102 | ||
103 | config MD_RAID10 | |
08fb730c N |
104 | tristate "RAID-10 (mirrored striping) mode" |
105 | depends on BLK_DEV_MD | |
1da177e4 LT |
106 | ---help--- |
107 | RAID-10 provides a combination of striping (RAID-0) and | |
4d2554d0 | 108 | mirroring (RAID-1) with easier configuration and more flexible |
1da177e4 LT |
109 | layout. |
110 | Unlike RAID-0, but like RAID-1, RAID-10 requires all devices to | |
111 | be the same size (or at least, only as much as the smallest device | |
112 | will be used). | |
113 | RAID-10 provides a variety of layouts that provide different levels | |
114 | of redundancy and performance. | |
115 | ||
116 | RAID-10 requires mdadm-1.7.0 or later, available at: | |
117 | ||
118 | ftp://ftp.kernel.org/pub/linux/utils/raid/mdadm/ | |
119 | ||
120 | If unsure, say Y. | |
121 | ||
16a53ecc N |
122 | config MD_RAID456 |
123 | tristate "RAID-4/RAID-5/RAID-6 mode" | |
1da177e4 | 124 | depends on BLK_DEV_MD |
f5e70d0f | 125 | select RAID6_PQ |
9bc89cd8 DW |
126 | select ASYNC_MEMCPY |
127 | select ASYNC_XOR | |
ac6b53b6 DW |
128 | select ASYNC_PQ |
129 | select ASYNC_RAID6_RECOV | |
1da177e4 LT |
130 | ---help--- |
131 | A RAID-5 set of N drives with a capacity of C MB per drive provides | |
132 | the capacity of C * (N - 1) MB, and protects against a failure | |
133 | of a single drive. For a given sector (row) number, (N - 1) drives | |
134 | contain data sectors, and one drive contains the parity protection. | |
135 | For a RAID-4 set, the parity blocks are present on a single drive, | |
136 | while a RAID-5 set distributes the parity across the drives in one | |
137 | of the available parity distribution methods. | |
138 | ||
16a53ecc N |
139 | A RAID-6 set of N drives with a capacity of C MB per drive |
140 | provides the capacity of C * (N - 2) MB, and protects | |
141 | against a failure of any two drives. For a given sector | |
142 | (row) number, (N - 2) drives contain data sectors, and two | |
143 | drives contains two independent redundancy syndromes. Like | |
144 | RAID-5, RAID-6 distributes the syndromes across the drives | |
145 | in one of the available parity distribution methods. | |
146 | ||
1da177e4 LT |
147 | Information about Software RAID on Linux is contained in the |
148 | Software-RAID mini-HOWTO, available from | |
149 | <http://www.tldp.org/docs.html#howto>. There you will also | |
150 | learn where to get the supporting user space utilities raidtools. | |
151 | ||
16a53ecc | 152 | If you want to use such a RAID-4/RAID-5/RAID-6 set, say Y. To |
1da177e4 | 153 | compile this code as a module, choose M here: the module |
16a53ecc | 154 | will be called raid456. |
1da177e4 LT |
155 | |
156 | If unsure, say Y. | |
157 | ||
1da177e4 LT |
158 | config MD_MULTIPATH |
159 | tristate "Multipath I/O support" | |
160 | depends on BLK_DEV_MD | |
161 | help | |
93bd89a6 N |
162 | MD_MULTIPATH provides a simple multi-path personality for use |
163 | the MD framework. It is not under active development. New | |
164 | projects should consider using DM_MULTIPATH which has more | |
165 | features and more testing. | |
1da177e4 LT |
166 | |
167 | If unsure, say N. | |
168 | ||
169 | config MD_FAULTY | |
170 | tristate "Faulty test module for MD" | |
171 | depends on BLK_DEV_MD | |
172 | help | |
173 | The "faulty" module allows for a block device that occasionally returns | |
174 | read or write errors. It is useful for testing. | |
175 | ||
176 | In unsure, say N. | |
177 | ||
cafe5635 KO |
178 | source "drivers/md/bcache/Kconfig" |
179 | ||
2995fa78 | 180 | config BLK_DEV_DM_BUILTIN |
6341e62b | 181 | bool |
2995fa78 | 182 | |
1da177e4 LT |
183 | config BLK_DEV_DM |
184 | tristate "Device mapper support" | |
2995fa78 | 185 | select BLK_DEV_DM_BUILTIN |
1da177e4 LT |
186 | ---help--- |
187 | Device-mapper is a low level volume manager. It works by allowing | |
188 | people to specify mappings for ranges of logical sectors. Various | |
189 | mapping types are available, in addition people may write their own | |
190 | modules containing custom mappings if they wish. | |
191 | ||
192 | Higher level volume managers such as LVM2 use this driver. | |
193 | ||
194 | To compile this as a module, choose M here: the module will be | |
195 | called dm-mod. | |
196 | ||
197 | If unsure, say N. | |
198 | ||
17e149b8 MS |
199 | config DM_MQ_DEFAULT |
200 | bool "request-based DM: use blk-mq I/O path by default" | |
201 | depends on BLK_DEV_DM | |
202 | ---help--- | |
203 | This option enables the blk-mq based I/O path for request-based | |
204 | DM devices by default. With the option the dm_mod.use_blk_mq | |
205 | module/boot option defaults to Y, without it to N, but it can | |
206 | still be overriden either way. | |
207 | ||
208 | If unsure say N. | |
209 | ||
cc109201 | 210 | config DM_DEBUG |
6341e62b | 211 | bool "Device mapper debugging support" |
0149e57f | 212 | depends on BLK_DEV_DM |
cc109201 BR |
213 | ---help--- |
214 | Enable this for messages that may help debug device-mapper problems. | |
215 | ||
216 | If unsure, say N. | |
217 | ||
95d402f0 MP |
218 | config DM_BUFIO |
219 | tristate | |
d57916a0 | 220 | depends on BLK_DEV_DM |
95d402f0 MP |
221 | ---help--- |
222 | This interface allows you to do buffered I/O on a device and acts | |
223 | as a cache, holding recently-read blocks in memory and performing | |
224 | delayed writes. | |
225 | ||
4f81a417 MS |
226 | config DM_BIO_PRISON |
227 | tristate | |
d57916a0 | 228 | depends on BLK_DEV_DM |
4f81a417 MS |
229 | ---help--- |
230 | Some bio locking schemes used by other device-mapper targets | |
231 | including thin provisioning. | |
232 | ||
991d9fa0 JT |
233 | source "drivers/md/persistent-data/Kconfig" |
234 | ||
1da177e4 LT |
235 | config DM_CRYPT |
236 | tristate "Crypt target support" | |
0149e57f | 237 | depends on BLK_DEV_DM |
1da177e4 | 238 | select CRYPTO |
3263263f | 239 | select CRYPTO_CBC |
1da177e4 LT |
240 | ---help--- |
241 | This device-mapper target allows you to create a device that | |
242 | transparently encrypts the data on it. You'll need to activate | |
243 | the ciphers you're going to use in the cryptoapi configuration. | |
244 | ||
cf352487 LP |
245 | For further information on dm-crypt and userspace tools see: |
246 | <http://code.google.com/p/cryptsetup/wiki/DMCrypt> | |
1da177e4 LT |
247 | |
248 | To compile this code as a module, choose M here: the module will | |
249 | be called dm-crypt. | |
250 | ||
251 | If unsure, say N. | |
252 | ||
253 | config DM_SNAPSHOT | |
0149e57f AK |
254 | tristate "Snapshot target" |
255 | depends on BLK_DEV_DM | |
55494bf2 | 256 | select DM_BUFIO |
1da177e4 | 257 | ---help--- |
4d2554d0 | 258 | Allow volume managers to take writable snapshots of a device. |
1da177e4 | 259 | |
991d9fa0 | 260 | config DM_THIN_PROVISIONING |
d57916a0 AK |
261 | tristate "Thin provisioning target" |
262 | depends on BLK_DEV_DM | |
991d9fa0 | 263 | select DM_PERSISTENT_DATA |
4f81a417 | 264 | select DM_BIO_PRISON |
991d9fa0 JT |
265 | ---help--- |
266 | Provides thin provisioning and snapshots that share a data store. | |
267 | ||
c6b4fcba JT |
268 | config DM_CACHE |
269 | tristate "Cache target (EXPERIMENTAL)" | |
270 | depends on BLK_DEV_DM | |
271 | default n | |
272 | select DM_PERSISTENT_DATA | |
273 | select DM_BIO_PRISON | |
274 | ---help--- | |
275 | dm-cache attempts to improve performance of a block device by | |
276 | moving frequently used data to a smaller, higher performance | |
277 | device. Different 'policy' plugins can be used to change the | |
278 | algorithms used to select which blocks are promoted, demoted, | |
279 | cleaned etc. It supports writeback and writethrough modes. | |
280 | ||
f2836352 JT |
281 | config DM_CACHE_MQ |
282 | tristate "MQ Cache Policy (EXPERIMENTAL)" | |
283 | depends on DM_CACHE | |
284 | default y | |
285 | ---help--- | |
286 | A cache policy that uses a multiqueue ordered by recent hit | |
287 | count to select which blocks should be promoted and demoted. | |
288 | This is meant to be a general purpose policy. It prioritises | |
289 | reads over writes. | |
290 | ||
8735a813 HM |
291 | config DM_CACHE_CLEANER |
292 | tristate "Cleaner Cache Policy (EXPERIMENTAL)" | |
293 | depends on DM_CACHE | |
294 | default y | |
295 | ---help--- | |
296 | A simple cache policy that writes back all data to the | |
297 | origin. Used when decommissioning a dm-cache. | |
298 | ||
eec40579 JT |
299 | config DM_ERA |
300 | tristate "Era target (EXPERIMENTAL)" | |
301 | depends on BLK_DEV_DM | |
302 | default n | |
303 | select DM_PERSISTENT_DATA | |
304 | select DM_BIO_PRISON | |
305 | ---help--- | |
306 | dm-era tracks which parts of a block device are written to | |
307 | over time. Useful for maintaining cache coherency when using | |
308 | vendor snapshots. | |
309 | ||
1da177e4 | 310 | config DM_MIRROR |
0149e57f AK |
311 | tristate "Mirror target" |
312 | depends on BLK_DEV_DM | |
1da177e4 LT |
313 | ---help--- |
314 | Allow volume managers to mirror logical volumes, also | |
315 | needed for live data migration tools such as 'pvmove'. | |
316 | ||
5442851e MP |
317 | config DM_LOG_USERSPACE |
318 | tristate "Mirror userspace logging" | |
319 | depends on DM_MIRROR && NET | |
320 | select CONNECTOR | |
321 | ---help--- | |
322 | The userspace logging module provides a mechanism for | |
323 | relaying the dm-dirty-log API to userspace. Log designs | |
324 | which are more suited to userspace implementation (e.g. | |
325 | shared storage logs) or experimental logs can be implemented | |
326 | by leveraging this framework. | |
327 | ||
9d09e663 | 328 | config DM_RAID |
d9f691c3 | 329 | tristate "RAID 1/4/5/6/10 target" |
035220b3 | 330 | depends on BLK_DEV_DM |
b12d437b | 331 | select MD_RAID1 |
d9f691c3 | 332 | select MD_RAID10 |
9d09e663 N |
333 | select MD_RAID456 |
334 | select BLK_DEV_MD | |
335 | ---help--- | |
d9f691c3 | 336 | A dm target that supports RAID1, RAID10, RAID4, RAID5 and RAID6 mappings |
9d09e663 N |
337 | |
338 | A RAID-5 set of N drives with a capacity of C MB per drive provides | |
339 | the capacity of C * (N - 1) MB, and protects against a failure | |
340 | of a single drive. For a given sector (row) number, (N - 1) drives | |
341 | contain data sectors, and one drive contains the parity protection. | |
342 | For a RAID-4 set, the parity blocks are present on a single drive, | |
343 | while a RAID-5 set distributes the parity across the drives in one | |
344 | of the available parity distribution methods. | |
345 | ||
346 | A RAID-6 set of N drives with a capacity of C MB per drive | |
347 | provides the capacity of C * (N - 2) MB, and protects | |
348 | against a failure of any two drives. For a given sector | |
349 | (row) number, (N - 2) drives contain data sectors, and two | |
350 | drives contains two independent redundancy syndromes. Like | |
351 | RAID-5, RAID-6 distributes the syndromes across the drives | |
352 | in one of the available parity distribution methods. | |
353 | ||
1da177e4 | 354 | config DM_ZERO |
0149e57f AK |
355 | tristate "Zero target" |
356 | depends on BLK_DEV_DM | |
1da177e4 LT |
357 | ---help--- |
358 | A target that discards writes, and returns all zeroes for | |
359 | reads. Useful in some recovery situations. | |
360 | ||
361 | config DM_MULTIPATH | |
0149e57f AK |
362 | tristate "Multipath target" |
363 | depends on BLK_DEV_DM | |
fe9233fb CS |
364 | # nasty syntax but means make DM_MULTIPATH independent |
365 | # of SCSI_DH if the latter isn't defined but if | |
366 | # it is, DM_MULTIPATH must depend on it. We get a build | |
367 | # error if SCSI_DH=m and DM_MULTIPATH=y | |
368 | depends on SCSI_DH || !SCSI_DH | |
1da177e4 LT |
369 | ---help--- |
370 | Allow volume managers to support multipath hardware. | |
371 | ||
fd5e0339 KU |
372 | config DM_MULTIPATH_QL |
373 | tristate "I/O Path Selector based on the number of in-flight I/Os" | |
374 | depends on DM_MULTIPATH | |
375 | ---help--- | |
376 | This path selector is a dynamic load balancer which selects | |
377 | the path with the least number of in-flight I/Os. | |
378 | ||
379 | If unsure, say N. | |
380 | ||
f392ba88 KU |
381 | config DM_MULTIPATH_ST |
382 | tristate "I/O Path Selector based on the service time" | |
383 | depends on DM_MULTIPATH | |
384 | ---help--- | |
385 | This path selector is a dynamic load balancer which selects | |
386 | the path expected to complete the incoming I/O in the shortest | |
387 | time. | |
388 | ||
389 | If unsure, say N. | |
390 | ||
26b9f228 | 391 | config DM_DELAY |
d57916a0 AK |
392 | tristate "I/O delaying target" |
393 | depends on BLK_DEV_DM | |
26b9f228 HM |
394 | ---help--- |
395 | A target that delays reads and/or writes and can send | |
396 | them to different devices. Useful for testing. | |
397 | ||
398 | If unsure, say N. | |
399 | ||
51e5b2bd | 400 | config DM_UEVENT |
e0b215da AK |
401 | bool "DM uevents" |
402 | depends on BLK_DEV_DM | |
51e5b2bd MA |
403 | ---help--- |
404 | Generate udev events for DM events. | |
405 | ||
3407ef52 | 406 | config DM_FLAKEY |
d57916a0 AK |
407 | tristate "Flakey target" |
408 | depends on BLK_DEV_DM | |
3407ef52 JB |
409 | ---help--- |
410 | A target that intermittently fails I/O for debugging purposes. | |
411 | ||
a4ffc152 | 412 | config DM_VERITY |
d57916a0 AK |
413 | tristate "Verity target support" |
414 | depends on BLK_DEV_DM | |
a4ffc152 MP |
415 | select CRYPTO |
416 | select CRYPTO_HASH | |
417 | select DM_BUFIO | |
418 | ---help--- | |
419 | This device-mapper target creates a read-only device that | |
420 | transparently validates the data on one underlying device against | |
421 | a pre-generated tree of cryptographic checksums stored on a second | |
422 | device. | |
423 | ||
424 | You'll need to activate the digests you're going to use in the | |
425 | cryptoapi configuration. | |
426 | ||
427 | To compile this code as a module, choose M here: the module will | |
428 | be called dm-verity. | |
429 | ||
430 | If unsure, say N. | |
431 | ||
9d0eb0ab JR |
432 | config DM_SWITCH |
433 | tristate "Switch target support (EXPERIMENTAL)" | |
434 | depends on BLK_DEV_DM | |
435 | ---help--- | |
436 | This device-mapper target creates a device that supports an arbitrary | |
437 | mapping of fixed-size regions of I/O across a fixed set of paths. | |
438 | The path used for any specific region can be switched dynamically | |
439 | by sending the target a message. | |
440 | ||
441 | To compile this code as a module, choose M here: the module will | |
442 | be called dm-switch. | |
443 | ||
444 | If unsure, say N. | |
445 | ||
0e9cebe7 JB |
446 | config DM_LOG_WRITES |
447 | tristate "Log writes target support" | |
448 | depends on BLK_DEV_DM | |
449 | ---help--- | |
450 | This device-mapper target takes two devices, one device to use | |
451 | normally, one to log all write operations done to the first device. | |
452 | This is for use by file system developers wishing to verify that | |
453 | their fs is writing a consitent file system at all times by allowing | |
454 | them to replay the log in a variety of ways and to check the | |
455 | contents. | |
456 | ||
457 | To compile this code as a module, choose M here: the module will | |
458 | be called dm-log-writes. | |
459 | ||
460 | If unsure, say N. | |
461 | ||
afd44034 | 462 | endif # MD |